Nanjing Chemical Material Corp.
Service

How Is Ethyl Bromide Prepared From Ethyl Alcohol How Is Ethyl Bromide Prepared From Ethyl Alcohol

1. The formation of Ethyl bromide

10 mL of 95% ethanol and 9 mL of water are added to a 100 mL round bottom flask. Under constant shaking and cooling, 19 mL of concentrated sulfuric acid is slowly added. The mixture is cooled to room temperature. The finely divided 15 g of sodium bromide is added with stirring, and a few additional zeolites are added. Carefully shake the flask to make it even. The lower end of the condenser tube is connected to the lead pipe. Ethyl bromide has a very low boiling point and is extremely volatile. To avoid losses, cold water and 5 mL of saturated sodium bisulfite solution are added to the receiver. Cool in an ice water bath and allow the end of the receiving tube to be submerged in the aqueous solution. Start heating on low heat, make the reaction liquid boil slightly, and let the reaction proceed smoothly until no ethyl bromide is flowing out. (As the reaction proceeds, the reaction mixture begins to have a large amount of gas. At this time, the heating intensity must be controlled. Do not cause bumping and then the solid gradually decreases. When the solids disappear completely, the reaction solution becomes viscous and then becomes a transparent liquid. Now it is near the end of the reaction. Check the presence or absence of ethyl bromide in a beaker containing water.

2. Purification of ethyl bromide

Pour the liquid from the receiver into the separatory funnel. After static stratification, transfer the crude ethyl bromide below to the dry conical flask. Under the cooling of ice water, carefully add 1 ~ 2mL concentrated sulfuric acid, while shaking the cone to cool. The lower concentrated sulfuric acid is separated by a dry separatory funnel. The upper layer of ethyl bromide is poured from a tapping funnel into a 50 mL flask, and several zeolites are added for distillation. Since the boiling point of ethyl bromide is very low, the receiver should be cooled in ice water. Accept the fraction of 37 ~ 40 °C. The yield is about 10 g (The yield is about 54%).

Pure ethyl bromide is a colorless liquid with a boiling point of 38.4 ° C and nD 20 = 1.4239

Note: If the reaction mixture is not shaken before heating, the reaction is prone to bumping and the reaction fails. When starting the reaction, heat it with a small heat to avoid the escape of hydrogen bromide. When adding concentrated sulfuric acid, be sure to pay attention to cooling to avoid the loss of ethyl bromide. The experiment process uses two liquid separations, the first time to retain the lower layer, and the second time to the upper layer product. During the reaction, neither the reaction time is enough, nor the distillation time is too long. The water is over-distilled to cause the sodium sulfate to solidify in the flask.

 Ethyl bromide

Related Products Wiki
  • Market Application Direction of Glycolic Acid

    Market Application Direction of Glycolic Acid

    March 13, 20191.Chemical cleaningAs an organic acid, glycolic acid has a good cleaning function for certain metal scales. Since glycolic acid does not contain chloride ions, it is extremely corrosive to equipment m...view
  • What Is The Active Diluent Of Epoxy Resin?

    What Is The Active Diluent Of Epoxy Resin?

    August 6, 20191.Product IntroductionThe active diluent of epoxy resin is a kind of epoxy compound with small molecular weight containing epoxy group. It has a light color, low viscosity and good compatibility with ...view
  • 2018 Chemspec Europe

    2018 Chemspec Europe

    January 29, 2019June 20th-21th@ Cologne, GermanyAs one of the largest fine and speciality chemical exhibition in the world, Chemspec 2018 was staged during June 20th-21st 2018 at Cologne, Germany. This year's exhibit...view
  • 2017 Oleon Distributor Meeting

    2017 Oleon Distributor Meeting

    January 31, 2018Date:2017/11/02-11/04Place: Siem Reap, Cambodia Thanks for the invitation from Oleon, this is the third year for NCMC to attend Oleon’s AP& ME distributor meeting. Members from Oleon Belgium base, to...view
  • Application of Expandable Microspheres

    Application of Expandable Microspheres

    April 29, 2019Expanded microspheres (also known as foamed microspheres) are high molecular polymers. Its outer shell is made of a high molecular polymer (acrylic eye copolymer) which is a hydrocarbon inside. In the...view
  • 18th China International Lubricants and Technology Exhibition

    18th China International Lubricants and Technology Exhibition

    January 30, 2018September 21-23, 2017 Beijing·China International Exhibition CenterAs the most professional, authoritative and largest international exhibition in China lubricant industry, China International Lubr...view
Related Products
  • TEL:+86-25-52337978
  • EMAIL: info@njchm.com
  • ADDRESS:12/F, Block B, Technology and Innovation Building, Nanjing University of Technology, No.5 New Model Road, Nanjing 210009, China